Carnivore: "A carnivore is an animal that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of animal tissue"
"mainly animal tissue"

....?

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I think it is Anglicization of a technical term. http://tolweb.org/Carnivora/15971 says the giant panda is in "Carnivora". It also says the vernacular name for "Carnivora" is "carnivores".

The BBC article qoutes Kristofer Helgen, "The olinguito is a carnivore - that group of mammals that includes cats, dogs and bears and their relatives. Many of us believed that list was complete, but this is a new carnivore - the first to be found on the American continent for more than three decades."